view the document coming from the Twain device in the user interface of device. The user will have the ability to perform one of the actions proposed by this interface (for example: save the document, modify the default parameters of the device). The available actions depend on the device used.

Example

// Saves the document found in the scanner in the "MyPhoto.JPEG" file// The document will be saved in black and whiteIF TwainToBMP("C:\Temp\MyPhoto.BMP", False, TwainBlackWhite) = True THENInfo("The document was saved")ELSEError("The document was not scanned")END

Name and full (or relative) path of file (up to 260 characters). The file extension is optional. A UNC path can be used.If this parameter is not specified or if it corresponds to an empty string (""), the user will have to enter the full name of the JPEG file in a file picker.

<Image Quality>: Optional integer

Quality of the document image (value included between 1 and 100). The lower the image quality will be, the higher the compression rate of the image will be and the smaller the file size will be.

The default image quality will be used:

if this parameter is not specified or if it corresponds to 0.

if the specified quality is not supported by the device.

if <User Interface> is set to True.

<User Interface>: Optional boolean

True (default value) if the user interface of the Twain device must be displayed. When saving the document, the <BMP file> will be proposed by default.

False if the user interface of the Twain device must not be displayed.

Type of image used to save the document (classified by order of color management):

Order for managing the colors

0 (Default value)

Default image of device.

1

TwainPalette

Image whose colors are issued from a palette.

2

TwainRGB

RGB image.

3

TwainGrayScale

Image in grayscale.

4

TwainBlackWhite

Image in black and white.

-

TwainAnyType

Any type of image.

If these constants are combined, the best type of image supported by the device will be selected (according to the order of color management). See remarks for more details.

The default type of image will be used:

if this parameter is not specified or if it corresponds to 0.

if the specified type of image is not supported by the device.

if <User Interface> is set to True.

<Number of Bits per Pixel>: Optional integer

Amount of information about the colors (to display or print each pixel in an image). The larger the number of bits per pixel, the sharper the color rendering will be. The possible values for this parameter depend on the type of image used:

Type of image

Possible values

Image whose colors are issued from a palette (TwainPalette constant)

1, 4 or 8

RGB image (TwainRGB constant)

8, 10 or 16

Image in grayscale (TwainGrayScale constant)

8 or 16

Image in black and white (TwainBlackWhite constant)

1

If this parameter is not specified, the default number of bits per pixel will be used.

<Image Resolution>: Optional real

Number of pixels per inch (the possible values depend on the device used). The default image resolution will be used:

if this parameter is not specified or if it corresponds to 0.

if the specified resolution is not supported by the device.

if <User Interface> is set to True.

<Image Contrast>: Optional real

Contrast of the image (value included between -1000 and 1000). The default image contrast will be used:

if this parameter is not specified or if it corresponds to 0.

if the specified contrast is not supported by the device.

if <User Interface> is set to True.

<Image Brightness>: Optional real

Brightness of the image (value included between -1000 and 1000). The default image brightness will be used:

if this parameter is not specified or if it corresponds to 0.

if the specified brightness is not supported by the device.

if <User Interface> is set to True.

<Duplex Mode>: Optional boolean

True to scan a document on both sides,

False (by default) to scan the document on a single side.

<Automatic Load>: Optional boolean

Versions 15 and laterTrue to automatically load the pages in the device.

New in version 15True to automatically load the pages in the device.

True to automatically load the pages in the device.

Remarks

Document coming from the Twain device

The "document coming from the Twain device" corresponds to:

the document found in a scanner during the call to TwainToJPEG. In this case, the parameters specified in TwainScanZone are taken into account.

the image broadcasted by a "web camera" during the call to TwainToJPEG.

the first photo saved in a digital camera. Note: If the user interface is used, the retrieved document will correspond to the photo selected by the user. If several photos are selected, only the first selected photo will be retrieved.

Managing the type of image

If several constants are combined in <Type of Image>, the best type of image supported by the device will be selected (according to the order of color management).

For example: If this parameter corresponds to TwainBlackWhite + TwainRGB, the type of the image will be:

RGB if this type is supported by the device.

black and white otherwise.

Duplex scanner

If the scanner supports the duplex mode, you have the ability to perform a double-sided scan. The generated document contains both sides of the scanned document.

Note: Depending on the hardware used, the Twain driver may not be sufficient to support a double-sided scan. You may have to install additional drivers supplied by the manufacturer.

Multi-page scanner with loader

If the scanner includes a loader and if it supports the multi-pages, you have the ability to perform a scan of all the pages in a row.